Is there a graphics card connected? If yes, try removing it and testing with the monitor connected to the onboard.
If no card, for further troubleshooting, a case speaker would be helpful: http://www.newegg.com/Product/Product.aspx?Item=N82E16812201032
Is there a graphics card connected? If yes, try removing it and testing with the monitor connected to the onboard.
If no card, for further troubleshooting, a case speaker would be helpful: http://www.newegg.com/Product/Product.aspx?Item=N82E16812201032